Closets are perfect for vocal booths because they are often small and carpeted to reduce bouncing sound waves. Run your microphone cables to your closet and setup a shock-resistant microphone stand as well. You may choose to place carpeting or sound dampening material on the walls to further deaden the sound in your vocal booth.
Clear your bathroom of all items to ensure that there is no rattling during recording. They can often be ideal environments for recording. Although many engineers prefer to work with dry vocals, which are those that are free from any room ambiance, others love the natural reverberation achieved in a bathroom.
Build a small vocal booth in your studio. Construct the room using basic drywall and make it no larger than 6 feet by 6 feet. Use sound-deadening material on the walls as well as carpeting on the floor. Although a window is not necessary, if your vocal booth is close to the control room, you can place a window with double paned, sound-proof glass. This window will allow you to watch the vocalist during recording and make the person feel more comfortable while tracking.
Construct a heavy, sound-proof door for your vocal booth so that there are no sound leak. By controlling the sound properties of your vocal booth and deadening the sound, you can add lush reverbs and delays as needed or keep the vocals dry.
Convert a utility closet in your studio to record vocals if space is at a premium. This will allow you to efficiently use the space you have allotted for tracking by adding flexibility to your recording options. Not only can this booth be used for vocals, but you can also use this space to record guitar and bass cabinets.